Have you tried moving the window using the keyboard?

To do so, just open Task Manager, then press the the Alt key and the Spacebar at the same time. This should bring up a menu to move, size, minimize and maximize the window.

For now, try moving it by pressing M and use the arrow keys to reposition the window? You can also try to Maximize it, failing that.

BTW, what's the resolution of your screen? 1024x768? 800x600? 640x480?